<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <style>
    .outer {
      display: flex;
      height: 200px;
      text-align: center;
    }
    .left {
      width: 200px;
      height: 200px;
      background-color: #4cae4c;
    }
    .right {
      flex: 1;
      height: 200px;
      background-color: #8a6d3b;
    }
  </style>
</head>
<body>
<div class="outer">
  <div class="left">左边</div>
  <div class="right">右边</div>
</div>
</body>
</html>
